#define _CRT_SECURE_NO_WARNINGS 1
#include <iostream>
using namespace std;
namespace zkf
{
	int Add(int x=1, int y=2)
	{
		int q = x + y;
		return q;
	}
	int a = 6;

}
int main()
{
	cout << zkf::a << " " << zkf::Add() << endl;
	return 0;
}